What is a pixel clock?

A:

Quick Answer

A pixel clock is an oscillator, timing circuit or external signal that divides incoming video into pixels. The speed of the pixel clock refers to the capability of a monitor, television or computer graphics card to process pixels per second. This is expressed in megahertz or million pixels per second.

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Video Graphics Array, or VGA, was first introduced by IBM in 1987. A VGA's pixel clock operates at 25 or 28 megahertz. VGA is recognized as the analog computer display standard. Digital Visual Interface, or DVI, offers a much faster pixel clock. Speeds can range from 165 megahertz for a single link to 348 megahertz for a dual link.